Door opening and closing device



J. M. NELSON.

DOOR OPENING AND CLUSING DEVICE.

APPLICATION FILED 02c 24. 1921.

1 26,9QL Patented Aug. '22 1922.

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DOOR O PENING AND CLOSING DEVICE.

APPLICATION FILED DEC 24. 1921.

1,426,9m I Patented Aug. 22 1922 m I 2 SHEETS-SHEET 2.

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i entree stares JQSEFE EE- NUN, 01E MINNQHS, MINNESOTA.

- DB @FIENING AND GLQSING' DEVICE.

11,426,9ll1l...

To all witom it may concern:

I citizen of the United Statesfi residing at Minneapolis, in the county of State of Minnesota, have invented a new and useful Door Opening and ClosingDevice, of which the following is a specificatmn.

My invention relates to improvements in door opening and closin devices.

Its object is to rovi e a simple, durable and inexpensive e ectrically actuated devlce of this kind, capable of being easily installed and constructed toavoid injury to the driving mechanism thereof and to the door structure operated thereby.

With the foregoing and other ob ects 1n view, which will appear in the following description, the invention resides in the novel combination and arrangement of parts and in the details of construction herelnafter described and claimed.

In the drawings, Fig. 1 is a view illustrating, in section, a sliding door structure, and, in plan, the principal parts of an appl ed door opening and closing device, embodying my invention, said view being taken on the line 1-1 of Fig. 2; Fig. 2 is a vertical sectional view taken on the line 2-2 of F1g. 1; Fig. 3 is a similar view takenon the line 3-3 ofFig. 1; Fig. 4c is a plan view illustrating, in detail, one of the door buffers andassociated switch arms, said view being taken on-the line l-tof Fig. 3; Fig. is a side elevation, in detail, of the driving motor, clutch and a portion of the rod actuated by said motor; Fig. 6 is an end elevation of the same and Figs. 7 and,8 are diagrammatic views illustrating my invention as applied:

to swinging doors, double and single.

Referring to the drawings in which s milar reference letters and numerals have been used to designate similar parts throughout the several views, I have employed the letter A to indicate doors and the letter B to designate the door frames and associated wall structures. In Fig. 1, l have showna sliding door A, carried by hangers 1O traveling upon a rail '11, on the wall structure B. threaded actuating rod 12 is secured at one end to a bracket 13 fixed to the door A. A reversible motor C depending from a hanger 14 on the wall structure B (or ceiling, not shown) is equipped with a hollow or tubular driving shaft 15" designed to Specification of Letters Patent.

ennepin and Patented Aug. 22, 11922.

Application filed December 24%,1921. Serial No. 52 1,70 1.

' freely receive the actuating rod 12. A Be it known that l, Josnrn M. NnnsoN, a.

elling nut 16 is threaded on said rod 12. etween the nut 16 and one end of the motor shaft 15 is a clutch D for turning said nut with said shaft. T his clutch (Fig. includes a driving member 17 and a driven member 18. The clutch driving member 17 comprises an annular body 19 including a hub 20 secured upon the motor shaft 15. Said body 19 is formed with an annular depression 21 in its outer face and 1s provided with cars 22 and stops 23; The driven member 18 of the clutch D includes a circular plate 24: fitted within the annular depression 21 in the body 19. Radial fingers 25, pivoted medially on theears 22 of the body 19, bear at their inner ends upon the plate 24. lhe pressure of said fingers 25 against said plate is regulated by means of tension springs 26. These springs encircle threaded stems 27, which abut against the stops 2'3 on the body 19, said springs-being interposed between set nuts 28 on said stems and the outer endsof the fingers 25. -A

universal joint is supplied between the clutch member 18 and the nut 16. This joint includes a ring 29 pivoted, through the medium of opposed pins 30, to the nut'lfi, said ring, in turn, being pivoted, through opposed pins 31, to lugs 32 on the plate 24. Buffers E and F are arranged at opposite sides of the door A to yieldingly arrest the movements of said door at the extremities of its throws. Each bufi'er (Fig. a) includes a bracket 33, which is secured to the wall structure Each bracket is formed with a pair of guides 34:, a pin 35 being slidably mounted therein. Encircling each pin 35 is a coiled spring 36, the same being interposed between a collar 37 on its respective pin and one of the guides 34. Said springs 36 yieldingly hold the forward ends of the pins 35 in the path of the door A, but yield under increasing tension, when the pins 35 are shifted by pressure of the moving door A. Switches 38 and 38 accompany the bufiers F and F. Referring to Fig. f, it will be noted that the arm 38 of each switch is pivoted upon its respective bracket 33 one end thereof having a slidable pivotal connection with the rear end of the adjacent pin 35. In Fig. 1, it will be seen that the free ends of the arms 38 make and break contact with terminals 39. An electrical starting.

the door A on ages the yieldin buifer F, the

circuit including the motor C, also includes the bufier actuated switches and a double switch G, preferably, accessible from an au-' tomobile, at a posltion removed from the door A and protected by a suitably guarded housing (not shown). A lead wire 40, supplies current to either of two branch leads 41 and 42, according to the position of the bar 43 of the switch G. Current from the. branch lead 41 reaches the motor C through the switch G into position shown in dotted.

lines, thereby connecting the lead 40 and branch lead 41. Said branch lead 41 being connected with the supplementaig lead 41" through the switch 38, the motor is turned in a direction causing the nut 29 to ull upon the rod 12 and open the door A. he force of the spring 36 in the buifer E assists in the initial opening movement of the door, thus minimizingqresistance against the motor, in

ear the end of its opening throw,

momentum 0 said door an motor bein thereby gradually diminished. At the en of its throw, the door is brought to rest, due to the interruption of current to the motor C, by the throw of the switch arm 38 of the switch '38 and the consequent disengagement of said arm from its companion terminal 39. To close the door A, the operator,

' usually by reaching from his automobile,

throws the switch bar 43 into position shown in solid lines, Fig. 1. the motor through the branch lead 42, switch 38 and supplementary lead 42, causes said motor to turn in a direction resulting in the closing of the door A, by the thrust of the.

rod 12. In its initial closing movement the motor is relieved considerably by the orce of the bufier F. The momentum of the door, near the end of its closing throw, is reduced by the hun er E and the motor C is finally sto ped by the throw of the switch arm' 38 o the switch 38. The universal mounting for the nut 29 avoids bindin and undue wear, while the clutch D avoi s injury to thejmotor C and other driving parts,

1n case the door meets with any substantial resistance, while current is supplied to the motor.

One form of motor contemplated, includes a hanger bolt 45, which may turn in-its sup-- porting hanger 14 and thus provide a swiveled mounting for the motor. In one of my Current passing to' 'dium, between the motor shaft an alternate forms (Fi 8), the motor C is swiveled and the r 12 has a nection with the door A In the alternate form shown in Fig. 7,

links 46 join the rod 12 with the doors A.

I The screw thread connections between the propeller rods and motors, in the various forms illustrated, operate to lock the doors, when the motors are at rest; This feature prevents the swinging of the doors by wind or gravity and also saves the cost of the usually heavy and expensive door looks.

The principal advantages of my improved device reside in the simplicity of structure, ease of application, safety against injury to moving parts and, further, in the door looking feature.

Changes in the specific form of my invention as herein disclosed, may be made within the scope of what is claimed without pivotal conde arting from the spirit of my invention.

aving described my, invention, what I claim as new and desire to protect by Letters Patent is: r

1. In a device of the class described the combination with a door, of a threade actuating rod connected at one end to said door, a motor havin a hollow. driving shaft freely receiving sai actuating rod, and a nut threaded on the rod and rotated by said shaft to shift said rod longitudinally.

2. In a device of the class described, the

combination with a door, {of a threaded ac tuating rod connected at\ one end to said door, a motor having a hollow driving shaft freely receiving said actuating rod, a nilt threaded on the rod and a ower. transmitting clutch joining said sha t with said. nut, 1 I

one member thereof being fixed to the shaft and the other member fixed to the nut.

3, In a device of'the class described, the.

combination with a hinged door, of a threaded actuating rod connected at one end with said door, a motor, a swiveled mountin for ating rod connected at one end to said door,

a reversible motor having a hollow driving shaft freely receiving said actuating rod, a

nut threaded on the rod, a oonnectm menut,

holding the latter against endwise .movement, and yieldingly im artin to said nut,

neaaeoi said rod, a nut threaded on the rod, and a universally compensating connecting medium joining said nut with the motor shaft to turn the nut with said shaft and prevent endwise movement of the former with respect to the latter. a

8. In a device of the class described, the combination with a hinged doon of athreaded actuating rod pivotally connected at one end with said door, a reversible motor a swiveled mounting for the motor, said motor having a hollow driving shaft slidebly re ceiving said rod, a nut threaded on the rod and connecting means between said not and motor shaft to turn the nut with said shaft and prevent endwise movement of the former with respect to the latter.

7. In a device of the class a the combination with a door, of a threaded ac- In testimony whereof, I havesigned my name to this specification.

JGSEPH M. Nnnson. 

